I gave this some thought while I was driving across the state this evening. Two important points:
1. All digital cameras are ultimately disposable. All of them.
2. The best camera is the one in your hands.
That might sound a bit cliche, but 5 years of shooting with a DSLR has proved both points to me many times over. If you need to get back into photography, almost any camera is a good start. If you have glass that fits the Pentax mount, then find one of their entry level DSLRs that will work with your lenses and go. Spend less, not more, realizing that this camera is only going to be temporary. Mike Johnson, aka The Online Photographer, made an excellent post about starting in digital photography. It doesn't exactly apply to your situation, but it's a good read and has a lot of valuable information in it. Especially the part about buying a new monitor.